Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Study on the Reliability of Engineering Ceramics

구조용 세라믹스 강도의 신뢰성 평가에 관한 연구

  • 김부안 (부경대학교 재료공학과) ;
  • 남기우 (부경대학교 재료공학과)
  • Published : 1997.02.01
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Abstract

Silicon Nitride samples with different microstructure were prepared by hot pressing and subsequent heat treatment under N2 gas pressure. The fracture toughness (KIC)of Si3N4 increased with the increase of grain size, but the bending strength of plain specimen($\sigma$F) decreased. The relation between fracture stress($\sigma$c) and equivalent crack length(ae) agreed well with the calculated values by process zone size failure criterion. A probabilistic failure assessment curve is proposed based on both statistical character of $\sigma$F and KIC.

소결온도 및 열처리에 의하여 미세조직을 변화시킨 질화규소의 파괴강도특성 및 그 신뢰성 평가를 하였다. 결정립이 클수록 파괴인성치는 증가하였지만 굽힘강도는 저하하였다. 균열재의 파괴응력 $\sigma$c와 등가균열길이 ae와의 관계는 프로세스 존 크기 파기기준에 의한 계산 결과와 매우 잘 일치하였다. 그리고 굽힘파괴응력 $\sigma$F와 파괴인성치 KIC의 통계적 특성을 고려한 파괴평가고건을 제안하였다.

Keywords

References

  1. Jpn. Soc. Mech. Engrs. Relationship between strength and flaw size in glass and polycrystalline ceramics H.Kimoto;S.Usami;H.Miyata
  2. J. Jpn. Soc. Mater. Sci. Bending stress analysis of ceramics based on the statistical theory of stress fracture location Y.Taniguchi;J.Kitazumi;T.Yamada
  3. Jpn. Soc. Mech. Engrs. Effect of flaw size on elevated temperature static fatiguc limit of silicon nitride T.Machida;S.Usami;I.Takahashi
  4. J. Ceram. Soc. Jpn. v.93 Effect of defect size and notch root radius on fracture strength of engineering ceramics I.Takahashi;S.Usami;K.Nakakado;M.Miyata;S.Shida
  5. Engng. Fract. Mech. v.23 Strength of ceramics materials containing small flaw S.Usami;H.Kimoto;I.Takahashi;S.Shida
  6. J. Soc Strength Fract. Mater. v.21 Effect of micro damage on fracture strength of structural ceramics H.Miyata;K.Nakakado;H.Kimoto
  7. J. Am. Ceram. Soc. v.67 Crack-growth resistance of microcracking brittle materials A.G.Evans;K.T.Faber
  8. J. Mater. Sci. v.16 Increased fracture toughness of ceramics by energy - dissipative mechanisms W.Kreher;W.Pompe
  9. J. Jap Soc. mech. Engrs Non-destructive inspection and reliability of advaned materials T.Kishi
  10. J. Soc. Mater. Sci. Jap. v.37 no.415 Strength and fracture toughness of ceramic matrix particulate composites N.Miyata
  11. Jpn Soc. Mech Engrs. Study on the development of failure assessment diagram for ceramics B.A.Kim;K.Ando;N.Ogura
  12. Jpn. Soc. Mech. Engrs Process zone size fracture criterion for ceramics M.Iwasa;K.Ando;N.Ogura
  13. Fatigue Fract. Engng. Mater. Struct. Process zone size failure criterion and probabilistic fracture assessment curves for ceramics K Ando;B.A.Kim;M.Iwasa;N Ogura
  14. Engng. Fract. Mech. v.15 An empirical stress-in-tensity factor equation for the surface crack J.C.Newman;J.S.Raju
  15. 材料强度學 社團法人 日本材料學會